Gauge-drilling means



Patented Aug. 24, 1926.

UNITED STATES PATENT OFFICE.

LAMBERT BRESSER, F UERDINGEN0N-THERHINE, GERMANY, ASSIGNOR T0 THE FIRMWAGGONFABRIK .An-G., 0F UERDINGEN-ON-THE-RHINE, GERMANY.

GAUGE-Dalmine MEANS.

Application led September 26, 1925, Serial No. 58,697, and in GermanyMarch 23, 1925.

ing sleeves. In the drilling operation with the aid of stencils or pitch'gauges as heretofore practised, particularly for the manufacture ofinterchangeable structural parts of railroad cars and the like, therewas the necessity of employing large quantities of drilling sleeves orcollars'rigidly or loosely secured in the stencils or gauges, inasmuchas there was a comparatively very large waste of these sleeves by theconstant rubbing of the drill borer along the inner walls of saidsleeves. Now, in accordance with my invention means are provided todispense with the necessity of such collars or drilling sleeves, so asto eifect a very substantial economy of time, labor and money in themanufacture of 'interchangeable structural parts and of other articles.The invention is shown in a somewhat diagrammatic manner in elevationand part longitudinal section in Fig. 1 of the drawing. Fig. 2 is adetail in elevation, substantially illustrating the fastening andreleasing means which may be employed in connection with my invention.

The main shaft or spindle of the drilling machine is provided inaccordance with my invention with an intermediate spindle or 'shaft ewhich may be mounted thereon by conical fitting or the like. Thisintermediate spindle e of suitable material carries at its freeextremity the drill or borer h. Upon said intermediate spindle e asleeve or collar ais slidingly disposed which is provided at each endthereof with a ball bearying b. An outer sleeve or bearing casing cencloses the sleeve'a and the bearings andv is adapted to connect theball bearings to each other and carries at one of its lower ends adetachable funnel shaped chip receptacle f which surroundsthe drill hand is rovidedv at its frontend with the detac able` exchangeablecentering collar or bushing4 g. The diameter of the bore of this collarg is larger than that ofthe drill, so as 'to prevent contact thereofwith the 'inner'walll ofthe collar and'allow the chips to freelyprass upinto the receptacle f. The cover d isf provided at the other, upper endof the'sleeves a and c and constitutes a closing cap for the device, andit is provided with any suitablen suspending or supporting or lockingdevice.

Such supporting, locking and releasing means are shown by way ofexempliiication in F ig. 2 of the drawing. The entire device issuspended or supported in any suitable manner, as indicated at p, andcarries a collar or head Z upon which the spring- Aactuated levers` orgripping claws m are pivoted at o the free and preferably in-,yvardlydirected' .or hook-shaped ends of whichare'adapted to becomeengaged with therecesses s of the cover d. The grippers `m areiinder theaction of the springs n and may be manually operated by pressure upontheir outer ends t, so as to engage with or release the cover d andthereby the entire system of collars and sleeves.

The mode of operation of the device is substantially as follows Thestencil sheet z' carries the drilling apertures. When it is desired tocarry out the drilling operation, for instance upon the piece of work c,by means of the stencil or gauge, the entire desleeve g is introducedinto the particular hole of the stencil plate z'. Thereupon the drillshaft may be advanced into the operative positionwith its intermediatespindle e and the spiral drill It. After centering or starting the bore,the system -a is again raised by being, for instance, suspended from thespring-actuating hooks m, whilethe drill is now freely exposed andcentered and the chips are thereby readily discharged. The releasing andsuspension device which is connected to the main spindle is free torotate with the same. In order to be able to adapt the invention todifferent diameters ot' drilling holes, the intermediate spindle e is ofsuch a size that different conical iittings may be employed forconnecting the same to themain spindle or to the drill. The collar g maybe outwardly conical.

The invention has been shown by way of exemplification only, and itshould be understood that its broad principles admit of variousmodifications and changes of the ,vice is lowered and the drillingcollar or constructional features herein described and f illustrated,without deviatingfrom the scope and spirit of the invention, as definedin the appended claims.

I claim:-

l. Ina boring or drilling tool, a rotatable spindle, a drill bit carriedby the spindle, a housing slidably mounted on the spindle and in whichthe spindle is rotatably mounted, a chip receptacle detachably connectedwith the lower end of the housing, and a centering bushing at the outerend ot said receptacle through which the drill bit projects, the bore ofsaid bushing being of greater diameter than the bit for the free feed ofthe chips upwardly between the bit and bushing and into said receptacle.

2. In a boring or drilling tool, a rotatable spindle, a sleeve slidablyengaging the spindle and in which said spindle is rotatably mounted, ahousing enclosing the sleeve, anti-friction bearings interposed betweenthe sleeve and housing above and below the horizontal center of thehousing, a drill bit carried by the spindle, a chip receptacledetachably connected with the housing, and a centering bushing connectedwith the outer end of the receptacle, through which receptacle andbushing the drill bit extends, the bore ot the bushing being of greaterdiameter than the bitfor the free passage of the chips between the sameand the bit and upwardly into said receptacle.

3. In a boring or drilling device, a rotary spindle, a housing slidablyengaging the spindle and in which the spindle is revolubly mounted, aconical chip receptacle detachably connected with the outer end-of thehousing, a drill bit carried by the spindle and extending through thehousing, and a conical centering bushing detachably engag ing the outerreduced end of the receptacle and through which the drill bit extends,the bore of said bushing being of greater diameter than the drill bit topermit the chips to pass upwardly'between the same and into thereceptacle.

4. In a boring or drilling device, a rotary spindle, a suspending devicecarried by the spindle, a collar caried by the spindle, a housingslidably mounted on the spindle for movement toward and from said collarand in which housing the spindle is rotatably mounted, a chip collectingchamber detachably connected with the lower end of the housing, andprovided at its outer end with a centering bushing, a drill bit carriedby the spindle and extending outwardly through the chamber and bushing,a closure at the top of the housing provided with an annularly groovedhead, and spring fastening members on the collar engageable with theannular groove of the closure when the housing is slid u wardly on thespindle.

In testimony w ereof I aliix my signature.

LAMBERT BRESSER.

